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a piston pin is a machined high strength steel "tube" that goes thru the piston and connecting rod and holds them together.
A wristpin is the most critical fit in an engine. It is the pin that holds the piston on the connecting rod
I believe a gudgeon pin is what the British call a connecting rod pin (or wrist pin or piston pin) in a reciprocating assembly, (piston, connecting rod, crank ) It connects the piston head to the connecting rod.
The gudgeon pin or wrist pin (as it is called in the US), connects the piston to the connecting rod and provides a bearing for the connecting rod to pivot upon as the piston moves.
You need a hydraulic press to press the pin into the piston and through the connecting rod
The piston rod is more usually called the con rod or connecting rod. It is connected at the top end to the piston with what is called a wrist pin. (The wrist pin is a cylinder of steel that slides through the side of the piston and through the top hole in the connecting rod.) At the bottom end the connecting rod mates up to the crankshaft. There is what is called a rod cap that goes on the bottom of the connecting rod to hold that rod onto the journal of the crankshaft. The connecting rod's purpose is to transfer downward and upward thrust between the piston and crank. The combustion of fuel drives the piston down to the crankshaft were it is converted to rotary force which drives your wheels. The wrist pin, is called a piston pin or gudgeon pin in the UK. The hole in the con-rod is commonly called the small or little end, and the other end where the cap holds it to the crankshaft is the big end.
piston pin, piston rings, side bearings, connecting rod bearings
the piston to the connecting rod.
The piston to the connecting rod.
Piston to connecting rod
The piston pin joins the piston to the connecting rod. Igniting fuel / air mixture pushes down on the top of the piston, the piston transfers the force to the connecting rod, which in turn pushes against the crankshaft, converting the up and down motion of the piston to the rotary motion of the crankshaft. The piston pin allows back and forth motion of the connecting rod (as it's other end is moving back and forth in a circular motion with the crankshaft.)...if instead of a pin a solid joint was made from the piston to the connecting rod the engine would not be able to run, as the connecting rod would try to rock the piston back and forth (side to side, not up and down) as the rod was moved sideways with the crankshaft.
The connecting rod has a "wrist pin" which goes through the side of the piston and through the connecting rod. It is one of the most critical fit parts of an engine.The connecting rod or con rod connects the piston to the crank or crankshaft!!!